Based on the analysis of construction of hydrostatic transmission(HST)
a simulation model is built by AMEsim.By using the simulation
the result of transmission characteristic of HST is analyzed.The results show that research and analysis of relationship between HST characterist ics and structural parameters is convenient to improve HST performance
the analysis of transmission characteristic of HST can provide reference for the power mat ching and joint control of tractor engine and HST system.